Screw.



S` I. IVIOLONEY.

' SCREW'.

APPLICATION FILED DEC.2. 1914.

Patented Sept. 7, 1915.

Y SIMUN' Il'. MLONEY, 0E CHICAGO, ILLINOIS.

SC i

aisance.,

To all 'whom t may concern.' l

Be it known that L'SIM'ON J. ,MoLo'NEm a citizen of the United States, and a resident of the city of Chicago, county of Cook,

andState of Illinois, have invented certain and arrangements of parts hereinafter de-l scribed and claimed. y

rlhe invention will be best understood by reference to the accompanyin drawing formlng a part of this 4speciicatlon7 and in which',

Y i -re' lisa sideview ofra screw embodying my invention, 'shown 1n posrtlon of use, 2', a similar view but showing the 'guardingmeans 1n section, and Fig. 3, Yan

`enlarge'Vilboft'tfom plan view of a locking cap 4employed vin the construction.

' The" preferI ed vform of construction as illustratedi'nthe drawing comprises a screw l shank' 4 provided j -inga .screwdriver s with a' screw head -5 vhavlot 6 therein. The lower.

ortion 7 'of head 5- is given a` conical shape in ordeitoit -an ordinary counter-sinkv aroundfthefscrew hole, aswill be readily understood. The head 5 is also provided with l -air/"annular"'groove. 8 and a .substantially i home in the usual manner-with the portion l y 'hemispherical sheet metal capv 9 is' arranged to .jitj4v over said head, the sides of said cap eing'provided with slits 10 forming spring leavesv,thereinetweenY and -the lower 'ends of aid' leaves are provided' with inwardly ex- ''tendlng projections 11 ladapted to engage g .groovfe'S, as shown 1n.l"ig.2."

In use, the screwris' inserted'. and driven Specification ofi'etters Patent.

has for its object the provision v tially as described.

. of said ca 7 of the head fitting within the counter-sink. Then, the cap 9 is pressed over said head, said projections riding on the rounded sides of head 5 and automatically snapping into engagement with groove 8 thus locking said cap in' position.- The cap prevents access to the screw driver slot 6 and thus prevents removal of the screw.

While lv have illustrated and described the preferred form of construction for car'- rylng my invention into effect, 'this is capable of variation and modiication without departing from the spirit of the invention.

l, therefore, do not wish to be limited to the precise details ofl construction set forth, but desire to avail myself of such variations and modifications as come -within the scope of the appended claims.

Patented Sept. E?, i915. Application led December 2, 1914. Serial No. 875,191. 'i

Having described my invention 'what l claim as new and desire to secure by Letters Patent is:

'1. rihe combination with a screw shank and head, there being -an annular groove extending around said head, of a cap fitting over. said head andprovided with spring fastenings engaging said groove, substan- 2. rlhe combination withv a screw shank and head provided .with a screw driver slot, vthere being an annular groove formed in said head, of `-a substantially hemispherical metallic capitting vover said head, the sides being slitJ to form spring leaves and they ower ends of said leaves being kturned jinwardly to automatically engage said groove, substantially as described.

ln testimony whereof I have signed my name vto this ispecicationin the lpresence 4of two subscribingwltnesses.

MON J.MOLONEY. ,Witnessesr j i v dosHU'AjR. I-I. Ports, B. G. RIQHARDS.V 

